Claude Cowork can now run in a Chrome sidebar

**The Browser Is Now a Coworker's Desk** Anthropic's move to tuck Claude Cowork into a Chrome sidebar isn't a feature update—it's a strategic declaration. The browser tab is already saturated; the real estate left is the quiet strip of pixels on the right. By colonizing it, Anthropic signals that the future of AI isn't a destination you visit, but a presence that lives *alongside* your work, silently parsing context as you scroll, draft, and decide. This is the ambient AI race. It connects directly to Microsoft's Copilot embedding into Windows and Google's Gemini firing inside Gmail—the fight isn't over model quality anymore, it's over *proximity*. The sidebar is the new office desk. Whoever owns that sliver of screen owns the workflow, the data, and the habit loop. Claude Cowork is no longer a tool you open; it's a colleague who never leaves the room. The choreography matters: a chat in the sidebar means context stays persistent, screenshots and artifacts flow without tab-switching friction. This is Anthropic quietly positioning Claude as the default co-pilot for knowledge workers who live in the browser. The sidebar isn't the edge of your window. It's the center of your next job description.